Combination instrument

Abstract

A combination instrument has a disk that is transparent for light in the visible range and that has a dial region and an indicator region. It further has a dial imprint, which is applied to the back of the transparent disk in the dial region. In addition, a polarizing filter disk is provided, which is disposed on the back of the transparent disk aligned with the indicator region and comprises a circular polarizing filter. An optical indicator unit is provided, which is disposed in alignment with the indicator region on the back of the transparent disk and the polarizing filter disk.

1. A combination instrument comprising:
 a transparent disk that is transparent to light in a visible range having a viewing side and a back side opposite the viewing side, the disk comprising:
 a dial region; and 
 an indicator region, 
 
 a dial imprint applied to the back side of the transparent disk in the dial region; 
 a polarizing filter disk arranged on the back side of the transparent disk flush with the indicator region, the polarizing filter disk comprising a circular polarizing filter; and 
 a visual indicator unit arranged proximate to the indicator region, on a side of the polarizing filter disk opposite the transparent disk. 
 
     
     
       2. The combination instrument as claimed in  claim 1 , further comprising:
 a filter disk arranged between the transparent disk and the polarizing filter disk flush with the indicator region. 
 
     
     
       3. The combination instrument as claimed in  claim 2 , wherein the filter disk has a transmission factor for visible light of substantially between 50% and 20%, inclusive. 
     
     
       4. The method as claimed in  claim 3 , wherein the filter disk has a transmission factor for visible light of 25%. 
     
     
       5. The combination instrument as claimed in  claim 1 , wherein the transparent disk has a demirrored layer arranged on the viewing side. 
     
     
       6. The combination instrument as claimed in  claim 5 , wherein the demirrored layer is a matte, hard, clear varnish layer. 
     
     
       7. The combination instrument as claimed in  claim 2 , wherein the transparent disk and the filter disk comprise polycarbonate. 
     
     
       8. The combination instrument as claimed in  claim 2 , wherein the polarizing filter disk comprises polyvinyl alcohol. 
     
     
       9. The combination instrument as claimed in  claim 1 , wherein the filter disk is colored gray. 
     
     
       10. The combination instrument as claimed in  claim 1 , wherein the visual indicator unit further comprises a polarization filter. 
     
     
       11. The combination instrument as claimed in  claim 1 , wherein the polarizing filter disk is a film. 
     
     
       12. The combination instrument as claimed in  claim 2 , wherein the filter disk is a film. 
     
     
       13. The combination instrument as claimed in  claim 2 , wherein the transparent disk has a demirrored layer arranged on the viewing side. 
     
     
       14. The combination instrument as claimed in  claim 1 , wherein the transparent disk, the polarizing filter, and the visual indicator unit are substantially parallel to one another. 
     
     
       15. The combination instrument as claimed in  claim 1 , wherein the visual indicator comprises a flat screen.